CN109429328B

CN109429328B - Communication method, related device and system

Info

Publication number: CN109429328B
Application number: CN201710718038.6A
Authority: CN
Inventors: 张彪
Original assignee: Huawei Technologies Co Ltd
Current assignee: Huawei Technologies Co Ltd
Priority date: 2017-08-21
Filing date: 2017-08-21
Publication date: 2021-10-01
Anticipated expiration: 2037-08-21
Also published as: WO2019037604A1; CN109429328A

Abstract

The invention relates to a communication method, a related device and a system. In the embodiment of the invention, AMF equipment receives a joint registration request of the user equipment, wherein the joint registration request carries the position information of the user equipment in a 5G network; and then the registration of the user equipment in the 5G network is completed according to the joint registration request. After the registration of the 5G network is completed, sending a joint location update request to a Mobile Switching Center (MSC) of a circuit switching network, wherein the joint location update request carries the location information of the user equipment in the 5G network and the identifier of the AMF, then receiving a joint location update acceptance message sent by the MSC, wherein the joint location update acceptance message carries a temporary identifier allocated to the user equipment by a CS network, and sending a registration acceptance message to the user equipment, wherein the joint location update acceptance message carries the temporary identifier allocated to the user equipment by the CS network, thereby completing the registration of the user equipment in the CS network. After successful registration, the user equipment may subsequently use the temporary identity to make a voice call over the CS network.

Description

Communication method, related device and system

Technical Field

The present invention relates to the field of communications technologies, and in particular, to a communication method, a related apparatus, and a system.

Background

A fifth generation (5th generation,5G) network is a next generation network that network operators wish to deploy, which has high rate, low latency characteristics. In a 5G network, Voice service may be transmitted in an Internet Protocol (IP) manner, for example, in a Voice over Long Term Evolution (VoLTE) manner.

However, part of network operators do not deploy a VoLTE network based on an IP Multimedia Subsystem (IMS) technology, and the user equipment cannot register in the VoLTE network, so that voice call in a 5G network cannot be realized.

Disclosure of Invention

The embodiment of the invention provides a communication method, a related device and a related system capable of realizing voice communication in a 5G network.

In one aspect, an embodiment of the present invention provides a communication method applied to an AMF device, including the following steps:

receiving a joint registration request of the user equipment, wherein the joint registration request carries the position information of the user equipment in the 5G network; in addition, the joint registration request may also carry an identifier of the user equipment.

And the AMF equipment also completes the registration of the user equipment in the 5G network according to the joint registration request. After the registration of the 5G network is completed, sending a combined location update request to a mobile switching center MSC of a circuit switched network, where the combined location update request carries location information of the user equipment in the 5G network and an identifier of the AMF, and then receiving a combined location update acceptance message sent by the MSC, where the combined location update acceptance message carries a temporary identifier allocated by the CS network to the user equipment, and sending a registration acceptance message to the user equipment, where the combined location update acceptance message carries the temporary identifier allocated by the CS network to the user equipment, thereby completing the registration of the user equipment in the CS network. After successful registration, the user equipment may subsequently use the temporary identity to make a voice call over the CS network.

In one possible scheme, the location information of the user equipment in the 5G network includes an identifier of a cell of the user equipment in the 5G network.

In a possible scheme, the joint location update acceptance message and the registration acceptance message further carry a location area identifier allocated by the CS network to the user equipment, so that the RAN device of the CS network can page the user equipment through the location area identifier, that is, find the user equipment.

In a possible scheme, the AMF device further receives a non-access stratum NAS extended service request message sent by the user equipment, where the NAS extended service request message indicates that the user equipment needs to drop back to the CS network to initiate a voice call, and then sends an indication message that the user equipment drops back to the CS network to indicate that the user equipment drops back to the CS network to initiate a voice call.

In a possible scheme, the AMF device further receives a paging request message sent by an MCS of a CS network, where the paging request message carries an identifier of the user equipment; sending a paging message to the user equipment according to the identifier of the user equipment, and paging the user equipment; subsequently, receiving an NAS extended service request message sent by the user equipment, wherein the NAS extended service request message indicates that the user equipment needs to fall back to the CS network for voice call; and sending a notification message to a mobile switching center of the CS network to notify the MSC that the user equipment needs to fall back to the CS network for voice call. The notification message may also carry idle information of the ue, so that the MSC can know the connection status of the call, for example, that the call is being connected.

In one possible solution, the AMF device further sends an initial context setup request message to a radio access device of the 5G network, notifying the radio access device to set up an initial context for the user equipment, so as to prepare for handover of the user equipment to the CS network on the RAN side.

In a possible scheme, the AMF device further receives a registration completion message sent by the ue, and then sends a temporary identifier reallocation success message to the MSC, to notify the MSC that the joint registration of the ue is completed.

In a second aspect, an embodiment of the present invention provides a communication method, which is mainly applied to a mobile switching center MSC of a circuit switching CS network, and includes:

receiving a combined location updating request sent by access and mobility management function (AMF) equipment, wherein the combined location updating request carries location information of user equipment in a 5G network and an identifier of the AMF; updating the position of the user equipment to a Home Location Register (HLR) in the CS network, and distributing a temporary identifier of the CS network to the user equipment; then sending a joint location update acceptance message to the AMF corresponding to the AMF identifier, wherein the joint location update acceptance message carries the temporary identifier distributed to the user equipment by the CS network; and finally, receiving the temporary identifier reallocation completion message sent by the AMF, completing the combined registration of the user equipment, and after the registration is completed, the MSC can send the called party aiming at the user equipment to the user equipment for answering.

In a possible scheme, the MSC further allocates a location area identifier to the ue, and the combined location update accept message further carries the location area identifier allocated by the CS network to the ue.

In one possible approach, the MSC also receives a called request for the user equipment from the CS network; sending a paging request message to the AMF corresponding to the AMF identifier to request the AMF to page the user equipment; and then receiving a notification message sent by the AMF, and notifying the MSC that the user equipment needs to fall back to the CS network for voice call, so that the MSC can notify the calling party requested by the called party that the call is connected.

In a possible scheme, the MSC further receives a paging response message sent by the user equipment, and rings to the caller sending the called request, thereby notifying the caller.

In a third aspect, an embodiment of the present invention further provides an access and mobility management function AMF device, which includes: a receiving module, configured to receive a joint registration request of the user equipment, where the joint registration request carries location information of the user equipment in a 5G network;

the registration module is used for finishing the registration of the user equipment in the 5G network according to the joint registration request; and the joint updating module is used for sending a joint location updating request to a Mobile Switching Center (MSC) of a circuit switching network after the registration of the 5G network is completed, wherein the joint location updating request carries the location information of the user equipment in the 5G network and the identification of the AMF. The receiving module is further configured to receive a joint location update acceptance message sent by the MSC, where the joint location update acceptance message carries a temporary identifier allocated by the CS network to the user equipment; the AMF device further includes a sending module, configured to send a registration acceptance message to the user equipment, where the registration acceptance message carries a temporary identifier allocated by the CS network to the user equipment.

In a possible scheme, the receiving module in the AMF device is further configured to receive a non-access stratum NAS extended service request message sent by a user equipment, where the NAS extended service request message indicates that the user equipment needs to drop back to the CS network to initiate a voice call; the sending module is further configured to send an indication message to the user equipment, where the indication message falls to the CS network, and indicates the user equipment to fall back to the CS network to initiate a voice call.

In a possible scheme, the receiving module in the AMF device is further configured to receive a paging request message sent by an MCS of the CS network, where the paging request message carries an identifier of the user equipment;

the AMF equipment also comprises a paging module used for sending a paging message to the user equipment according to the identification of the user equipment and paging the user equipment; in addition, the receiving module is further configured to receive an NAS extended service request message sent by the user equipment, where the NAS extended service request message indicates that the user equipment needs to drop back to the CS network to perform a voice call; the sending module is further configured to send a notification message to the MSC to notify the MSC that the user equipment needs to drop back to the CS network for a voice call.

In a possible scheme, the sending module in the AMF device is further configured to send an initial context setup request message to a wireless access device of the 5G network, and notify the wireless access device to set up an initial context for the user equipment.

In a fourth aspect, an embodiment of the present invention provides a mobile switching center, which mainly includes:

a receiving module, configured to receive a joint location update request sent by an access and mobility management function AMF device, where the joint location update request carries location information of a user equipment in a 5G network and an identifier of the AMF; an updating module, configured to update a location of the user equipment to a home location register HLR in the CS network, and allocate a temporary identifier of the CS network to the user equipment; and a sending module, configured to send a joint location update acceptance message to the AMF corresponding to the identifier of the AMF, where the joint location update acceptance message carries the temporary identifier allocated by the CS network to the user equipment. The receiving module is further configured to receive a temporary identifier reallocation completion message sent by the AMF, where the joint registration of the user equipment is completed.

In a possible solution, the receiving module in the mobile switching center is further configured to receive a called request for the user equipment from the CS network; the mobile switching center also comprises a paging request module used for sending a paging request message to the AMF corresponding to the AMF identifier and requesting the AMF to page the user equipment; the receiving module is further configured to receive a notification message sent by the AMF, and notify the mobile switching center that the ue needs to drop back to the CS network for a voice call.

In a possible scheme, the mobile switching center further includes a receiving module, configured to receive a paging response message sent by the user equipment, and the mobile switching center further includes a ringing module, configured to ring a calling party corresponding to the called request.

In a fifth aspect, an embodiment of the present invention provides a general-purpose computer, which may be applied to the AMF device provided in the third aspect and may also be applied to the mobile switching center provided in the fourth aspect, where the general-purpose computer includes a memory, a processor, an input/output device, and the like. The memory stores program codes, and the processor can acquire and execute the program codes stored in the memory, so that the general-purpose computer can execute the communication method of the first aspect or the second aspect, where the specific execution process refers to the first aspect and the second aspect.

In a sixth aspect, an embodiment of the present invention provides a communication system, which includes the AMF device in the third aspect and the mobile switching center in the fourth aspect. The specific functions of the AMF device and the mobile switching center device are described in the above embodiments.

In an embodiment provided in any of the above aspects, the location information of the user equipment in the 5G network includes an identification of a cell of the user equipment in the 5G network. The MSC also distributes the location area identification in the CS network to the user equipment, and the combined location updating receiving message and the registration receiving message also carry the location area identification distributed by the CS network for the user equipment.

In an embodiment provided in any of the above aspects, the joint location update request further carries a 5G network location update type, where the 5G network location update type includes an initial registration or a location area update. And starting the registration process under the condition that the user equipment is started or is accessed to the operator network for the first time. The user equipment may also initiate the aforementioned registration procedure actively when detecting a location area update. Therefore, the CS network can acquire the position information of the user equipment in time and send the position information to the user equipment when the called party aiming at the user equipment exists.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts. Wherein:

fig. 1 is a schematic networking diagram of a communication system according to an embodiment of the present invention;

fig. 2 is a flowchart of a communication method according to a second embodiment of the present invention;

fig. 3 is a flowchart of a communication method according to a third embodiment of the present invention;

fig. 4 is a hardware configuration diagram of an AMF device and a mobile switching center according to a fourth embodiment of the present invention;

fig. 5 is a schematic structural diagram of an AMF device according to a fifth embodiment of the present invention;

fig. 6 is a schematic structural diagram of a mobile switching center according to a fifth embodiment of the present invention.

Detailed Description

In the embodiments of the present invention, the network operator may provide different generations of networks, such as a second generation (2G) network, a third generation (3G) network, where the 2G network includes but is not limited to Global System for Mobile communications (GSM), Enhanced Data rate for GSM Evolution (EDGE), Code Division Multiple Access (CDMA), and personal hand held telephone System (PHS) network, and the 3G network includes but is not limited to Code Division Multiple Access 2000 (CDMA 2000), Universal Mobile Telecommunications System (UMTS), and Time Division-Synchronous Code Division Multiple Access (TD-SCDMA) network. Both 2G networks and 3G networks belong to Circuit Switched (CS) networks. After a network operator deploys a 5G network, a 2G network, a 3G network, and the 5G network may coexist. After the 5G network is deployed, the call initiated or received by the user in the 5G network is continued in the CS network (2G network and 3G network). The technical solutions in the embodiments of the present invention will be described below with reference to the drawings in the embodiments of the present invention.

The present invention provides a communication method, a related apparatus and a system, referring to fig. 1, fig. 1 is a schematic networking diagram of a communication system according to an embodiment of the present invention.

As shown in fig. 1, a communication system according to the present invention includes a User Equipment (UE), a next generation Radio Access Network (NG-RAN) device for accessing the UE to a 5G Network, a GSM/EDGE Radio Access Network (GERAN) device for accessing the UE to the GSM Network, a UMTS Terrestrial Radio Access Network (UMTS) device for accessing the UE to the UMTS Network, a UTRAN (Access and mobility management function) device for performing mobility management on the UE accessing to the 5G Network, and a Mobile Switching Center (MSC) device for providing a voice call service or a short message service to the UE. The function of the mobile switching center device may be implemented by an MSC Server (MSC Server) and a Visitor Location Register (VLR) together. The NG-RAN device may also be referred to as a 5G RAN device, the MSC device may further be referred to as MSC for short, and the AMF device may further be referred to as AMF for short.

In this embodiment, the GERAN device may interact with the MSC through an a interface, for example, to transfer signaling of a Base Station Subsystem Application Part (BSSAP). The UTRAN device may interact with the MSC via the IU-CS interface, for example, to transfer signaling of a Radio Access Network Application Part (RANAP). The AMF may interact with the MSC via the NSGs interface, for example, to deliver messages such as a joint location update, paging (paging) and the like for the UE. Of course, the AMF may also interact with the MSC through other customization, which is not limited in the embodiment of the present invention.

In the embodiment of the invention, the UE supports to access a 5G network and can also support to access a 2G/3G network simultaneously. The UE is registered to the 5G network in the coverage range of the NG-RAN, and when the UE needs the voice service (initiates or receives the voice service), the UE falls back to the GERAN or the UTRAN to process the voice service, so that the cost pressure caused by deploying the VoLTE network is avoided, and the resources of network operators are saved.

In the embodiment of the present invention, since the UE needs to drop back to the CS network to process the call of the UE, the UE needs to initiate joint location update to the CS network after the NG-RAN registration, and the specific registration process refers to fig. 2, and the communication method (specifically, the user equipment registration method) provided in the second embodiment of the present invention specifically includes the following steps:

step 201, the AMF receives a joint registration request sent by the UE, and completes the registration process of the UE in the 5G network.

In this embodiment, the UE may send a joint registration request to the AMF after powering on, where the joint registration request carries current location information of the UE, for example, an identifier (cell ID) of a 5G cell where the UE currently resides. The AMF completes a registration process of the UE and sends location information of the UE to a device storing User Data, such as a User Data Management (UDM) device or other devices. In addition, the joint registration request also carries information such as the circuit-switched fallback (CSFB) feature supported by the terminal, the identity of the ue, and the like.

In this embodiment, the identifier of the user equipment may be a specific device identifier of the user terminal, and may also be an identifier of the user.

Step 202, the AMF sends a joint location update request to the MSC, where the joint location update request carries the location information of the UE.

In the embodiment of the present invention, after completing the registration of the 5G network, the AMF may send a joint location update request to the MSC in the CS network, and the address information of the UE may indicate that the location update is currently the 5G network location update. The above-mentioned combined location update request may also carry an identifier of the AMF, such as the name or IP address of the AMF. The combined location update request may also carry an identifier of the user equipment.

Step 203, the MSC stores the AMF identifier and updates the location information of the UE to a Home Location Register (HLR) of the CS network.

Step 204, after the MSC completes the location update of the CS network, the MSC responds to the AMF with a joint location update accept message, indicating that the location update of the UE in the CS network is completed.

Step 205, the AMF receives the joint location update accept message sent by the MSC, and sends a registration accept message to the UE.

The registration acceptance message indicates that the registration of the UE has been accepted by the AMF, the acceptance message carries a temporary identifier (e.g., a Temporary Mobile Station Identifier (TMSI)) and a location area identifier of the UE in the CS network, and also indicates that the NSGs interface is successfully established, and a subsequent MSC can page the UE through the NSGs interface, thereby preparing for a subsequent possible called voice service and a short message service.

In the embodiment of the invention, the UE can also send a registration completion message to the AMF after receiving the registration acceptance message, and the AMF sends a temporary identifier reallocation completion message to the MSC after receiving the registration completion message, thereby completing the registration process of the UE.

It should be noted that the registration procedure is triggered during the UE power-on process, but the UE may also trigger the registration procedure periodically, for example, every 24 hours. In addition, the UE may also trigger the registration procedure when it detects that the Location Area (LA) is updated.

After the UE completes the registration procedure, the voice call may be implemented through the CS network, and the specific procedure may continue with reference to fig. 2.

A user initiates a voice service call request through UE, and the communication method (specifically, the call processing method) provided by the embodiment of the invention comprises the following steps:

step 206, the UE sends a non-access stratum (NAS) extended service request message to the AMF, indicating that the AMF needs to perform a voice call in the CS network.

In this embodiment, the UE in the voice call is a calling party.

Step 207, the AMF receives the NAS extended service request message, and sends an indication message to the UE to drop back to the CS network if it is determined that the UE needs to initiate a voice call in the CS network.

Step 208, the UE redirects or hands over from the NG-RAN to the CS network, thereby accessing the CS network through GERAN or UTRAN.

After the UE is handed over to the CS network, the AMF releases the network resources occupied by the UE in the NG-RAN.

Step 209, the UE initiates a voice call procedure in the CS network, for example, the UE sends a call request message to the MSC, where the call request message carries a called number.

The embodiment of the invention can make full use of the existing CS network by dropping the voice call of the user back to the CS network, thereby saving the network investment.

In the embodiment of the invention, the UE can receive the call in the CS network besides initiating the voice call from the NG-RAN back to the CS network. Referring to fig. 3, fig. 3 is a flowchart of a communication method (specifically, a call processing method) according to a third embodiment of the present invention.

In this embodiment, the UE currently resides in the NG-RAN, and the MSC in the CS network receives call requests for the UE from other users. The call processing method provided by the embodiment of the invention comprises the following steps:

step 301, the MSC determines that the UE performs the joint location update, and then sends a paging request message to the AMF corresponding to the UE.

When UE initiates a combined registration to AMF, AMF sends a combined location update request to MSC, and the request carries the AMF identifier. Thus, after receiving the call for the UE, the MSC may determine that the UE performs a joint location update (or determine that the UE performs joint registration), and send a paging request (paging request) message to the AMF according to the stored AMF identifier.

Step 302, the AMF receives the paging request message and sends a paging message to the UE through the NG-RAN to notify the UE that a call is coming in.

Step 303, the UE receives the paging message, determines that it needs to answer the call in the CS network, and sends an NAS extended service request message to the AMF to indicate that the AMF needs to make a voice call in the CS network.

Step 304, the AMF receives the NAS extended service request message, determines that the UE needs to initiate a voice call in the CS network, and sends the service request message to the MSC to notify the MSC that the UE will drop back to the CS network for calling.

In the embodiment of the invention, the NAN extended service request message carries the NG-RAN cell identification, which indicates that the UE falls back to the CS network from the NG-RAN.

The service request message sent by AMF to MSC can also inform MSC that said UE is in idle state currently, after MSC receives the above service request message, MSC can inform calling user that current call is going on, MSC will stop sending paging request message to AMF.

Step 305, the AMF sends an initial UE context setup message to the NG-RAN requesting to set up a context of the initial UE.

Wherein the purpose of establishing the initial UE context is to drop the UE back to the CS network. The message may carry parameters such as indication information of CS network fallback, location area identifier, and the like.

Step 306, the UE redirects or hands over from the NG-RAN to the CS network, thereby accessing the CS network through GERAN or UTRAN.

After the context establishment of the initial UE is completed, the UE may fall back to the CS network. After the UE is handed over to the CS network, the AMF may release the network resources occupied by the UE in the NG-RAN.

Step 307, the UE sends a paging response message to the MSC in the CS network, responding to the paging request of the MSC.

After receiving the paging response returned by the UE, the MSC can continue the called party, and the UE performs voice communication in the CS network, thereby completing the process of falling the UE of the NG-RAN back to the CS network to continue the called party.

Referring to fig. 4, fig. 4 is a hardware structure diagram of an AMF device and a mobile switching center according to a fourth embodiment of the present invention.

The general computer shown in fig. 4 may be the AMF device shown in fig. 1, or may be the MSC device in fig. 1. Either the AMF device or the MSC may employ general purpose computer hardware including a processor 401, memory 402, bus 403, input device 404, output device 405, and network interface 406.

In particular, the memory 402 may include computer storage media in the form of volatile and/or nonvolatile memory such as read only memory and/or random access memory. Memory 402 may store an operating system, application programs, other program modules, executable code, and program data.

An input device 404, such as a keyboard or pointing device, such as a mouse, trackball, touch pad, microphone, joystick, game pad, satellite dish, scanner, or the like, may be used to input commands and information to the AMF device or the MSC. These input devices may be connected to the processor 401 through a bus 403.

Output device 405 may be used for AMF devices or MSC output information, and in addition to a monitor, output device 405 may be provided as other peripheral outputs, such as speakers and/or printing devices, which may also be connected to processor 401 via bus 403.

The AMF device or MSC may be connected to a Network, such as a Local Area Network (LAN), through a Network interface 406. In a networked environment, the computer implemented instructions stored in the AMF device or the MSC may be stored in a remote memory storage device and are not limited to being stored locally.

When the processor 401 in the AMF device executes the executable code or the application program stored in the memory 402, the AMF device may perform the method steps on the AMF device side in the above second and third embodiments, such as performing steps 201 and 202, 302, 304, and the like. For a specific implementation process, reference is made to the second embodiment and the third embodiment, which are not described herein again.

When the processor 401 in the MSC executes the executable code or the application program stored in the memory 402, the MSC may perform the method steps on the MSC side in the above second and third embodiments, such as performing steps 203 and 204, 301. For a specific implementation process, reference is made to the second embodiment and the third embodiment, which are not described herein again.

Referring to fig. 5, fig. 5 is a schematic structural diagram of an AMF device according to a fifth embodiment of the present invention.

As shown in the drawings, an AMF device provided in an embodiment of the present invention includes:

a receiving module 510, configured to receive a joint registration request of the user equipment, where the joint registration request carries location information of the user equipment in a 5G network;

a registration module 520, configured to complete registration of the user equipment in the 5G network according to the joint registration request;

a joint update module 530, configured to send a joint location update request to a mobile switching center MSC of a circuit switched network after registration of the 5G network is completed, where the joint location update request carries location information of the ue in the 5G network and an identifier of the AMF; the location information of the user equipment in the 5G network comprises the identification of the user equipment in the cell of the 5G network.

The receiving module is further configured to receive a joint location update acceptance message sent by the MSC, where the joint location update acceptance message carries a temporary identifier allocated by the CS network to the user equipment;

a sending module 540, configured to send a registration acceptance message to the user equipment, where the registration acceptance message carries a temporary identifier that is allocated to the user equipment by the CS network. In addition, the joint location update acceptance message and the registration acceptance message also carry the location area identifier allocated by the CS network for the user equipment.

In addition, the combined location update request also carries a 5G network location update type, where the 5G network location update type includes initial registration or location area update, and the AMF device notifies the MSC of the type of the location update of the user equipment this time through the update type parameter.

In the AMF device provided in this embodiment, the receiving module 510 is further configured to receive a non-access stratum NAS extension service request message sent by a user equipment, where the NAS extension service request message indicates that the user equipment needs to drop back to the CS network to initiate a voice call; the sending module 540 is further configured to send an indication message to the user equipment, where the indication message falls to the CS network, and indicates the user equipment to fall back to the CS network to initiate a voice call.

In the AMF device provided in this embodiment, the receiving module 510 is further configured to receive a paging request message sent by the MCS of the CS network, where the paging request message carries an identifier of the user equipment.

The AMF device further comprises a paging module 550, configured to send a paging message to the ue according to the identifier of the ue, so as to page the ue; in addition, the receiving module 510 is further configured to receive a NAS extended service request message sent by the user equipment, where the NAS extended service request message indicates that the user equipment needs to drop back to the CS network to perform a voice call; the sending module 540 is further configured to send a notification message to the MSC, notifying the MSC that the user equipment needs to fall back to the CS network for a voice call.

In addition, the sending module 540 in the AMF device is further configured to send an initial context setup request message to the radio access device of the 5G network, and notify the radio access device to set up an initial context for the user equipment.

In the present embodiment, the AMF device is presented in the form of a functional module. A "module" as used herein may refer to an application-specific integrated circuit (ASIC), an electronic circuit, a processor and memory that execute one or more software or firmware programs, an integrated logic circuit, and/or other devices that provide the described functionality. In a simple embodiment, one skilled in the art will recognize that the AMF device may also take the form shown in fig. 4. The functions performed by the receiving module 510, the registering module 520, the joint updating module 530, the sending module 540, and the paging module 550 may be implemented by the processor 401 and the memory 402 in fig. 4. For example, the function of the receiving module 510 to receive the joint registration request of the user equipment may be implemented by the processor 401 executing code stored in the memory 402.

Referring to fig. 6, fig. 6 is a schematic structural diagram of a mobile switching center MSC according to a sixth embodiment of the present invention.

As shown in the figure, the MSC provided in the embodiment of the present invention includes:

a receiving module 610, configured to receive a joint location update request sent by an access and mobility management function AMF device, where the joint location update request carries location information of a user equipment in a 5G network and an identifier of the AMF; the location information of the user equipment in the 5G network comprises the identification, longitude and latitude and the like of the user equipment in the cell of the 5G network.

An updating module 620, configured to update the location of the user equipment to a home location register HLR in the CS network, and allocate a temporary identifier of the CS network to the user equipment; and

a sending module 630, configured to send a joint location update acceptance message to the AMF corresponding to the identifier of the AMF, where the joint location update acceptance message carries the temporary identifier allocated by the CS network to the user equipment.

The receiving module 610 is further configured to receive a temporary identifier reallocation completion message sent by the AMF, where the joint registration of the user equipment is completed.

The mobile switching center provided in the embodiment of the present invention further includes an allocating module 640, configured to allocate a location area identifier to the user equipment, and further the joint location update acceptance message sent by the sending module 630 also carries the location area identifier.

In the mobile switching center provided in the embodiment of the present invention, the receiving module 610 is further configured to receive a called request for the user equipment from the CS network. At this time, the mobile switching center further includes a paging request module 650, configured to send a paging request message to the AMF corresponding to the identifier of the AMF, and request the AMF to page the ue, and the receiving module 610 is further configured to receive a notification message sent by the AMF, and notify the mobile switching center that the ue needs to fall back to the CS network for a voice call.

In the mobile switching center provided in the embodiment of the present invention, the receiving module 610 is further configured to receive a paging response message sent by the user equipment, and the mobile switching center further includes a ringing module 660 configured to ring a calling party corresponding to the called request.

The MSC provided in the embodiment of the present invention may be used in the foregoing first, second, and third embodiments, and the method steps performed by the MSC in the second embodiment and the third embodiment are completed through cooperation among the receiving module 610, the updating module 620, the sending module 630, the allocating module 640, the paging request module 650, and the ringing module 660. Compared with the MSC in the prior art, the MSC provided in this embodiment has the same beneficial effects as the foregoing method embodiment when performing the user equipment joint registration and call processing procedure, and for details, refer to the description of the foregoing method embodiment.

As will be appreciated by one of ordinary skill in the art, various aspects of the invention, or possible implementations of various aspects, may be embodied as a system, method, or computer program product. Accordingly, aspects of the present invention, or possible implementations of aspects, may take the form of an entirely hardware embodiment, an entirely software embodiment (including firmware, resident software, etc.) or an embodiment combining software and hardware aspects that may all generally be referred to herein as a "circuit," module "or" system. Furthermore, aspects of the invention, or possible implementations of aspects, may take the form of a computer program product, which refers to computer-readable program code stored in a computer-readable medium.

The above description is only for the specific embodiments of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present invention, and all the changes or substitutions should be covered within the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.

Claims

1. A communication method is applied to an access and mobility management function (AMF) device, and is characterized by comprising the following steps:

receiving a joint registration request of user equipment, wherein the joint registration request carries an identifier of the user equipment in a cell of a 5G network;

completing the registration of the user equipment in the 5G network according to the joint registration request;

after the registration of the 5G network is completed, sending a joint location update request to a Mobile Switching Center (MSC) of a Circuit Switching (CS) network, wherein the joint location update request carries an identifier of the user equipment in a cell of the 5G network, an identifier of the AMF and a 5G network location update type, and the 5G network location update type comprises initial registration or location area update;

receiving a joint location update receiving message sent by the MSC, wherein the joint location update receiving message carries the temporary identifier allocated to the user equipment by the CS network and the location area identifier allocated to the user equipment by the CS network;

and sending a registration acceptance message to the user equipment, wherein the registration acceptance message carries the temporary identifier distributed to the user equipment by the CS network and the location area identifier distributed to the user equipment by the CS network.

2. The method of claim 1, further comprising:

receiving a non-access stratum (NAS) extended service request message sent by user equipment, wherein the NAS extended service request message indicates that the user equipment needs to fall back to the CS network to initiate a voice call;

and sending an indication message falling to the CS network back to the user equipment, and indicating the user equipment to fall back to the CS network to initiate the voice call.

3. The method of claim 1 or 2, further comprising:

receiving a paging request message sent by an MSC of the CS network, wherein the paging request message carries an identifier of the user equipment;

sending a paging message to the user equipment according to the identifier of the user equipment, and paging the user equipment;

receiving an NAS extended service request message sent by the user equipment, wherein the NAS extended service request message indicates that the user equipment needs to fall back to the CS network for voice calling;

and sending a notification message to a mobile switching center of the CS network to notify the MSC that the user equipment needs to fall back to the CS network for voice call.

4. The method of claim 3, further comprising:

and sending an initial context establishment request message to the wireless access equipment of the 5G network, and informing the wireless access equipment of establishing an initial context for the user equipment.

5. A communication method applied to a mobile switching center MSC of a circuit switched CS network, comprising:

receiving a joint location update request sent by access and mobility management function (AMF) equipment, wherein the joint location update request carries an identifier of user equipment in a cell of a 5G network, the identifier of the AMF and a 5G network location update type, and the 5G network location update type comprises initial registration or location area update;

updating the position of the user equipment to a Home Location Register (HLR) in the CS network, and distributing the temporary identifier of the CS network and the position area identifier of the CS network to the user equipment;

sending a joint location update acceptance message to the AMF corresponding to the AMF identifier, wherein the joint location update acceptance message carries the temporary identifier allocated to the user equipment by the CS network and the location area identifier allocated to the user equipment by the CS network;

and receiving the temporary identification reallocation completion message sent by the AMF, and completing the joint registration of the user equipment.

6. The method of claim 5, further comprising:

receiving a called request for the user equipment from the CS network;

sending a paging request message to the AMF corresponding to the AMF identifier to request the AMF to page the user equipment;

and receiving a notification message sent by the AMF, and notifying the MSC that the user equipment needs to fall back to the CS network for voice call.

7. The method of claim 6, further comprising:

and receiving a paging response message sent by the user equipment, and ringing a calling party sending a called request.

8. An access and mobility management function, AMF, device, comprising:

a receiving module, configured to receive a joint registration request of a user equipment, where the joint registration request carries an identifier of the user equipment in a cell of a 5G network;

the registration module is used for finishing the registration of the user equipment in the 5G network according to the joint registration request;

a joint update module, configured to send a joint location update request to a mobile switching center MSC of a circuit switched CS network after registration of the 5G network is completed, where the joint location update request carries an identifier of a cell of the user equipment in the 5G network, an identifier of the AMF, and a 5G network location update type, and the 5G network location update type includes initial registration or location area update;

the receiving module is further configured to receive a joint location update acceptance message sent by the MSC, where the joint location update acceptance message carries the temporary identifier allocated by the CS network to the user equipment and the location area identifier allocated by the CS network to the user equipment;

a sending module, configured to send a registration acceptance message to the user equipment, where the registration acceptance message carries the temporary identifier allocated by the CS network to the user equipment and the location area identifier allocated by the CS network to the user equipment.

9. The AMF device of claim 8,

the receiving module is further configured to receive a non-access stratum NAS extension service request message sent by the user equipment, where the NAS extension service request message indicates that the user equipment needs to drop back to the CS network to initiate a voice call;

the sending module is further configured to send an indication message that falls to the CS network back to the user equipment, indicating that the user equipment falls back to the CS network to initiate a voice call.

10. The AMF device of claim 8,

the receiving module is further configured to receive a paging request message sent by an MSC of the CS network, where the paging request message carries an identifier of the user equipment;

the AMF equipment also comprises a paging module used for sending a paging message to the user equipment according to the identification of the user equipment and paging the user equipment;

the receiving module is further configured to receive an NAS extended service request message sent by the user equipment, where the NAS extended service request message indicates that the user equipment needs to drop back to the CS network to perform a voice call;

the sending module is further configured to send a notification message to the MSC to notify the MSC that the user equipment needs to drop back to the CS network for a voice call.

11. The AMF device of claim 10,

the sending module is further configured to send an initial context setup request message to the wireless access device of the 5G network, and notify the wireless access device to set up an initial context for the user equipment.

12. A mobile switching center of a circuit switched, CS, network, comprising:

a receiving module, configured to receive a joint location update request sent by an access and mobility management function (AMF) device, where the joint location update request carries an identifier of a cell of a user equipment in a 5G network, the identifier of the AMF, and a 5G network location update type, and the 5G network location update type includes initial registration or location area update;

an updating module, configured to update a location of the user equipment to a home location register HLR in the CS network, and allocate, to the user equipment, the temporary identifier of the CS network and the location area identifier of the CS network;

a sending module, configured to send a joint location update acceptance message to an AMF corresponding to the identifier of the AMF, where the joint location update acceptance message carries a temporary identifier allocated by the CS network to the user equipment and a location area identifier allocated by the CS network to the user equipment;

the receiving module is further configured to receive a temporary identifier reallocation completion message sent by the AMF, where the joint registration of the user equipment is completed.

13. The mobile switching center of claim 12,

the receiving module is further configured to receive a called request for the user equipment from the CS network;

the mobile switching center also comprises a paging request module, which is used for sending a paging request message to the AMF corresponding to the AMF identifier to request the AMF to page the user equipment;

the receiving module is further configured to receive a notification message sent by the AMF, and notify the mobile switching center that the ue needs to drop back to the CS network for a voice call.

14. The mobile switching center of claim 13,

the receiving module is further configured to receive a paging response message sent by the user equipment, and the mobile switching center further includes a ringing module configured to ring a calling party corresponding to the called request.